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Build Identifier: 

create file: /etc/systemd/network/50-vxlan0.netdev
[NetDev]
Name=vxlan0
Kind=vxlan

[Network]
Id=33
Local=192.168.205.33
Remote=192.168.205.34



Reproducible: Always

Steps to Reproduce:
1.create file: /etc/systemd/network/50-vxlan0.netdev
[NetDev]
Name=vxlan0
Kind=vxlan

[Network]
Id=33
Local=192.168.205.33
Remote=192.168.205.34

2. Run:
systemctl disable --now wicked.service
systemctl enable systemd-network.service
rcnetwork restart

Actual Results:  
rcnetwork status | grep vxlan shows:

systemd-networkd: /etc/systemd/network/50-vxlan0.netdev:8: vxlan invalid
multicast 'Remote' address, ignoring assignment: 192.168.205.34

Expected Results:  
startup vxlan0 correctly.

There is a patch has fixed it:
https://github.com/openSUSE/systemd/commit/bf443be99565e4327f1c8c12b79d98b4c1529cf1

but seems not merge into SLE15 base yet.

BTW:
this patch changes two file, one is xml for man, but missing 'Group=' contents.